About three months ago I started tracking the number of miles that Waze thinks I've driven vs my odometer. I've been keeping Waze on religiously in a dash mount and with this tracking have noticed that Waze is losing around 10% of my miles. I can easily understand that. But in the last week or so something has happened and the lost percentage has gone way up. Here are end of day accumulated miles, as shown on my odometer vs waze.com:

I have learned a few things about when waze.com updates (and sometimes doesn't). I know there can be a lag, and that some miles never come through. But losing 57% over six days, when Waze was on and working normally throughout? This is a first. Something appears to be misfiring.